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Update and simplify NixOS documentation (#1495)

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Some updates and simplifications to the NixOS specific part of documentation.
This commit is contained in:
Marek Fajkus 2021-03-03 03:27:02 +00:00
parent 74cb13aa70
commit a5170625dc
1 changed files with 17 additions and 22 deletions
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39
docs/linux_dependencies.md
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@ -47,9 +47,11 @@ sudo xbps-install -S pkgconf alsa-lib-devel libX11-devel eudev-libudev-devel
## NixOS
Add a `build.rs` file to your project with the following:
Add a `build.rs` file to your project containing:
```rust
# build.rs
fn main() {
if cfg!(target_os = "linux") {
println!("cargo:rustc-link-lib=vulkan");
@ -58,37 +60,30 @@ fn main() {
```
These packages provide the dependencies required to run a bevy project. They can be installed globally or via nix-shell.
Based on your global configuration it also might be necessary to allow unfree packages:
`nix-shell -p pkgconfig x11 xorg.libXcursor xorg.libXrandr xorg.libXi vulkan-tools lutris vulkan-headers vulkan-loader vulkan-validation-layers alsaLib`
```bash
export NIXPKGS_ALLOW_UNFREE=1 # needed for lutris
nix-shell -p cargo pkgconfig udev lutris alsaLib x11 xorg.libXcursor xorg.libXrandr xorg.libXi vulkan-tools vulkan-headers vulkan-loader vulkan-validation-layers
```
Alternatively, you can copy the following code block and create a file called `shell.nix`. You can now enter nix-shell just by running `nix-shell`.
Alternatively, you can define `shell.nix` containing:
```nix
# shell.nix
{ pkgs ? import <nixpkgs> { } }:
pkgs.mkShell {
with pkgs;
mkShell {
buildInputs = [
pkgs.alsaLib
pkgs.lutris
pkgs.pkgconfig
pkgs.vulkan-headers
pkgs.vulkan-loader
pkgs.vulkan-tools
pkgs.vulkan-validation-layers
pkgs.x11
pkgs.xorg.libXcursor
pkgs.xorg.libXi
pkgs.xorg.libXrandr
cargo
pkgconfig udev alsaLib lutris
x11 xorg.libXcursor xorg.libXrandr xorg.libXi
vulkan-tools vulkan-headers vulkan-loader vulkan-validation-layers
];
}
```
At this point, projects should successfully compile but fail on execution. This is due to `glslang_validator` which, unfortunately, needs to have it's binary patched to link correctly. This is a known issue, and there are plans to remove this dependency.
And enter it by just running `nix-shell`.
1. `find target -type f -name glslang_validator` in order to find glslang_validator in `target/debug/build/bevy-glsl-to-spirv-<hash>/out/glslang_validator`. The directory containing glslang_validator will be referenced again, so save it for later: `export OUT_DIR="$(dirname $(find target -type f -name glslang_validator))"`.
2. Running `ldd $OUT_DIR/glslang_validator` may show `libstdc++.so.6` is not found. If all dependencies are found, then bevy should work. If not, install (globally or in nix-shell) any of the results found by `nix-locate -w libstdc++.so.6`. For example purposes, consider `nixos.gcc-unwrapped`. In theory, any of the ones in `find -L /nix/store -type f -name libstdc++.so.6` will work.
3. `patchelf --set-interpreter "$(cat $NIX_CC/nix-support/dynamic-linker)" --set-rpath /nix/store/784rh7jrfhagbkydjfrv68h9x3g4gqmk-gcc-8.3.0-lib/lib $OUT_DIR/glslang_validator`
4. Bevy should now be working correctly!
You should be able compile bevy programms using `cargo` within this nix-shell.